Designed by Vienna architects Delugan Meissl Associated Architects and finished in 2003, Haus Ray1 is an impressive extension added on to the flat roof of a 1960s era office building. The aluminum façade visible from the street is transected by long bands of windows, and the geometry of horizontal, vertical, and diagonal levels is continued in the interior of the loft. The use of load-bearing glass provides for spectacular views of Vienna.